JP6423285B2 - Data processing system - Google Patents

Description

  The present invention relates to a data processing system including a host device and a memory device connected to the host device.

  In a memory device in which content data is stored, it is an important issue to prevent unauthorized copying of content data from the viewpoint of copyright protection.

  In a usage mode in which a memory device is externally connected to a host device, a third party who intends to illegally copy content data uses an external device such as a probe between the external terminal of the host device and the external terminal of the memory device. After connecting, first, the function of each external terminal is specified. Specifically, the reference power supply terminal and ground terminal are specified from all the external terminals, and then the functions of the remaining data terminals are specified. Then, content data stored in the memory device is extracted by analyzing data transmitted and received between the host device and the memory device via each data terminal.

  The following Patent Document 1 discloses a device that can complicate the function specification of each data terminal by a third party by switching the arrangement of a plurality of data terminals based on the data access amount from the host device to the memory device. An inter-connection method is disclosed.

JP 2007-323470 A

  However, according to the technique disclosed in Patent Document 1, the reference power supply terminal and ground terminal are not subject to terminal switching, and their terminal positions are fixed. Therefore, a third party who attempts illegal copying can easily identify the external terminals functioning as the power supply terminal and the ground terminal among all the external terminals, and as a result, the remaining external terminals excluding the power supply terminal and the ground terminal can be used as data. It can be easily specified as a terminal. Therefore, in order to effectively prevent unauthorized copying of content data, it is desirable to improve such that the position of the data terminal is not easily specified by a third party.

  The present invention has been made in view of such circumstances, and a data processing system capable of making the function specification of each external terminal more complicated by making it difficult to specify the data terminal position by a third party. It is intended to obtain.

  A data processing system according to a first aspect of the present invention includes a host device and a memory device connected to the host device, and the host device has a plurality of host-side external terminals connected to the memory device. A data processing unit having a power supply terminal, a ground terminal, and a plurality of data terminals connected to the host side external terminal, the plurality of host side external terminals, the power supply terminal of the data processing unit, and the ground terminal And a host-side terminal switching unit that switches a connection relationship with the data terminal, and a host-side switching control unit that controls terminal switching by the host-side terminal switching unit, and the memory device includes the plurality of hosts A plurality of memory side external terminals connected to the side external terminals, and a power supply terminal, a ground terminal, and a plurality of data terminals connected to the memory side external terminals. Memory unit, a memory-side terminal switching unit that switches connection relationships between the plurality of memory-side external terminals and the power supply terminal, the ground terminal, and the data terminal of the memory unit, and switching control by the host-side switching control unit And a memory-side switching control unit that controls terminal switching by the memory-side terminal switching unit.

  According to the data processing system of the first aspect, the host-side terminal switching unit switches the connection relationship between the host-side external terminal and the internal terminals (power supply terminal, ground terminal, and data terminal) of the data processing unit, The side terminal switching unit switches the connection relationship between the memory-side external terminal and the internal terminals (power supply terminal, ground terminal, and data terminal) of the memory unit. In other words, not only the data terminal but also the power supply terminal and the ground terminal can switch the connection relationship between the external terminal and the internal terminal. Therefore, it is difficult for a third party who attempts illegal copying to specify external terminals that function as reference power supply terminals and ground terminals, and it is also difficult to specify external terminals that function as data terminals. That is, it is possible to make it difficult for a third party to specify the function of the external terminal. As a result, it becomes difficult to analyze the data transmitted and received between the data terminals, so that illegal copying of content data stored in the memory device can be effectively prevented.

  The data processing system according to the second aspect of the present invention is the data processing system according to the first aspect, in particular, the total number of the host side external terminals is the power supply terminal, the ground terminal, and the The total number of the memory-side external terminals is larger than the total number of data terminals, and the total number of the power supply terminals, the ground terminals, and the data terminals of the memory unit is larger.

  According to the data processing system of the second aspect, the total number of host side external terminals is larger than the total number of internal terminals of the data processing unit, and the total number of memory side external terminals is larger than the total number of internal terminals of the memory unit. In other words, all the host-side external terminals have dummy terminals that are not connected to the internal terminals of the data processing unit, and all the memory-side external terminals have dummy terminals that are not connected to the internal terminals of the memory unit. . Therefore, it is possible to further make it difficult to specify the function of the external terminal by a third party.

  The data processing system according to a third aspect of the present invention is the data processing system according to the second aspect, in particular, wherein the host side switching control unit is configured such that the power source of the data processing unit among the plurality of host side external terminals. A host-side dummy terminal that is not connected to any of the terminal, the ground terminal, and the data terminal, and the memory-side switching control unit is configured to switch the power supply terminal of the memory unit among the plurality of memory-side external terminals, the ground The memory-side dummy terminal that is not connected to either the terminal or the data terminal is switched.

  According to the data processing system of the third aspect, the host-side switching control unit switches the host-side dummy terminal not connected to the internal terminal of the data processing unit among the host-side external terminals, and the memory-side switching control unit Of the external side terminals, the memory side dummy terminals not connected to the internal terminals of the memory unit are switched. In this way, it is possible to make it more difficult for a third party to specify the function of the external terminal by actively switching the dummy terminal instead of fixing it.

  The data processing system according to a fourth aspect of the present invention is the data processing system according to the first aspect, in particular, wherein the host side switching control unit is connected to one host side external terminal of the data processing unit. Two or more data terminals are connected, and the memory-side switching control unit connects two or more data terminals of the memory unit to one memory-side external terminal. It is.

  According to the data processing system of the fourth aspect, the host side switching control unit connects two or more data terminals of the data processing unit to one host side external terminal, and the memory side switching control unit includes: Two or more data terminals of the memory unit are connected to one memory side external terminal. In this way, it is more difficult for a third party to specify the function of the external terminal by connecting two or more internal terminals to one external terminal instead of connecting the external terminal and the internal terminal one-on-one. It becomes possible to do.

  The data processing system according to a fifth aspect of the present invention is the data processing system according to the fourth aspect, in particular, wherein the host side switching control unit is connected to one of the host side external terminals. A combination of two or more data terminals is switched, and the memory side switching control unit switches a combination of two or more data terminals of the memory unit connected to one memory side external terminal. To do.

  According to the data processing system of the fifth aspect, the host-side switching control unit switches the combination of two or more data terminals of the data processing unit connected to one host-side external terminal, and the memory-side switching control unit Switches the combination of two or more data terminals of the memory unit connected to one memory-side external terminal. In this way, it is possible to make it more difficult for a third party to specify the function of the external terminal by actively switching the combination of two or more data terminals connected to one external terminal instead of fixing them. It becomes.

  A data processing system according to a sixth aspect of the present invention is the data processing system according to any one of the second to fifth aspects, and in particular, the host side switching control unit and the memory side switching control unit include the plurality of A host-side dummy terminal not connected to any of the power supply terminal, the ground terminal, and the data terminal of the data processing unit among the host-side external terminals, and the memory unit among the plurality of memory-side external terminals Insignificant data is transmitted / received to / from a memory-side dummy terminal that is not connected to any of the power supply terminal, the ground terminal, and the data terminal.

  According to the data processing system of the sixth aspect, the host side switching control unit and the memory side switching control unit transmit and receive meaningless data between the host side dummy terminal and the memory side dummy terminal. Therefore, it becomes difficult to distinguish between the dummy terminal and the data terminal, so that it is possible to further make it difficult to specify the function of the external terminal by a third party.

  The data processing system according to a seventh aspect of the present invention is the data processing system according to any one of the first to sixth aspects, and particularly corresponds to the power supply terminals of the data processing unit and the memory unit. When switching between the host-side external terminal and the memory-side external terminal, the host-side switching control unit before releasing the connection between the host-side external terminal before switching and the power supply terminal of the data processing unit The host-side external terminal after switching and the power supply terminal of the data processing unit are connected, and the memory-side switching control unit connects the memory-side external terminal before switching and the power supply terminal of the memory unit. Before canceling, the memory-side external terminal after switching and the power supply terminal of the memory unit are connected.

  According to the data processing system of the seventh aspect, when switching the external terminal functioning as the power supply terminal, the host side switching control unit connects the host side external terminal before switching and the power supply terminal of the data processing unit. Before canceling, connect the host-side external terminal after switching and the power supply terminal of the data processing unit, and the memory-side switching control unit connects the memory-side external terminal before switching and the power supply terminal of the memory unit. Before the release, the memory-side external terminal after switching and the power supply terminal of the memory unit are connected. Therefore, it is possible to reliably avoid the momentary interruption of the power supply from the host device to the memory device when switching the power supply terminal, and thus it is possible to prevent malfunction of the memory device due to the momentary interruption of the power supply. It becomes. In addition, compared with the case where driving power is supplied from the power supply unit such as a battery to the memory device before and after the switching timing of the power supply terminal, it is not necessary to mount the power supply unit to the memory device, thereby reducing cost and circuit scale. It becomes possible.

  The data processing system according to an eighth aspect of the present invention is the data processing system according to any one of the first to sixth aspects, and in particular, the memory device includes a power supply unit that supplies driving power to the memory device. Further, when the host side external terminal and the memory side external terminal corresponding to the power terminals of the data processing unit and the memory unit are switched, the power feeding unit is connected to the memory device before and after the switching timing. The driving electric power is supplied to the main body.

  According to the data processing system of the eighth aspect, the memory device includes a power supply unit such as a battery. When the external terminal functioning as a power supply terminal is switched, the power supply unit is connected to the memory device before and after the switching timing. Supply drive power. Accordingly, it is possible to reliably avoid the momentary interruption of the power supply to the memory device when the power supply terminal is switched, and thus it is possible to prevent a malfunction of the memory device due to the instantaneous interruption of the power supply. In addition, it is possible to avoid the occurrence of a communication interruption period as compared with the case where an overlapping period in which the old and new power terminals are overlapped before and after the switching timing of the power terminals.

  The data processing system according to the ninth aspect of the present invention is the data processing system according to any one of the first to eighth aspects, in particular, at the time of starting the data processing system, the host side switching control unit is The power supply terminal and the ground terminal of the data processing unit are respectively connected to predetermined specific host-side external terminals, and the memory-side switching control unit connects the power supply terminal and the ground terminal of the memory unit. The memory terminals are respectively connected to predetermined specific external terminals on the memory side.

  According to the data processing system of the ninth aspect, at the time of starting the data processing system, the host side switching control unit sets the power supply terminal and the ground terminal of the data processing unit to a predetermined specific host side external terminal. The memory side switching control unit respectively connects the power supply terminal and the ground terminal of the memory unit to predetermined specific memory side external terminals. As described above, by fixing the power supply terminal and the ground terminal to a specific external terminal at the time of system startup, the host device and the memory device can be quickly started up.

  The data processing system according to the tenth aspect of the present invention is the data processing system according to any one of the first to eighth aspects, in particular, when the data processing system is started up, the host side switching control unit is The power supply terminal and the ground terminal of the data processing unit are respectively connected to arbitrary host-side external terminals, and the memory-side switching control unit is configured to select a power supply potential and a ground potential among the plurality of memory-side external terminals. Two memory-side external terminals that generate a potential difference corresponding to the difference between the two are connected to the power supply terminal and the ground terminal of the memory section, respectively.

  According to the data processing system of the tenth aspect, at the start of the data processing system, the host-side switching control unit connects the power supply terminal and the ground terminal of the data processing unit to any host-side external terminal, and the memory The side switching control unit connects two memory-side external terminals having a potential difference corresponding to the difference between the power supply potential and the ground potential to the power supply terminal and the ground terminal of the memory unit, respectively. Therefore, since the power supply terminal and the ground terminal can be set arbitrarily even when the system is activated, it is possible to make it more difficult for a third party to specify the function of the external terminal.

  According to an eleventh aspect of the present invention, in the data processing system according to any one of the first to tenth aspects, the host side switching control unit and the memory side switching control unit may switch terminals. The execution condition for executing the process includes that a predetermined time set in advance has passed since the previous switching process was completed.

  According to the data processing system of the eleventh aspect, the external terminal switching process is executed when a predetermined time elapses after the previous switching process is completed. In this way, by executing the external terminal switching process based on the passage of time, the function of the external terminal is periodically changed, which may make it more difficult to specify the function of the external terminal by a third party. It becomes possible.

  A data processing system according to a twelfth aspect of the present invention is the data processing system according to any one of the first to eleventh aspects, particularly wherein the host side switching control unit and the memory side switching control unit switch terminals. The execution condition for executing the processing includes that a predetermined command for instructing execution of the switching processing is transmitted from the host device to the memory device.

  According to the data processing system of the twelfth aspect, when a predetermined command for instructing execution of the switching process is transmitted from the host device to the memory device, the external terminal switching process is executed. As described above, when the dedicated command for instructing the switching process is issued from the host device, the external terminal function is changed irregularly by executing the external terminal switching process. It is possible to further make it difficult to specify the function of the external terminal.

  A data processing system according to a thirteenth aspect of the present invention is the data processing system according to any one of the first to twelfth aspects, particularly wherein the host side switching control unit and the memory side switching control unit switch terminals. The execution condition for executing the processing includes that a predetermined value of data is transmitted and received between the host device and the memory device.

  According to the data processing system of the thirteenth aspect, the external terminal switching process is executed when a predetermined value of data is transmitted and received between the host device and the memory device. As described above, since the function of the external terminal is changed irregularly by executing the switching process of the external terminal based on the contents of data transmitted and received between both devices, the function of the external terminal by a third party Identification can be made more difficult.

  A data processing system according to a fourteenth aspect of the present invention is the data processing system according to any one of the first to thirteenth aspects, particularly wherein the host device and / or the memory device has a predetermined external environmental factor. A measurement unit for measuring further includes an execution condition in which the host-side switching control unit and the memory-side switching control unit execute a terminal switching process. Is included.

  According to the data processing system of the fourteenth aspect, the external terminal switching process is executed when the measured value of the external environmental factor by the measuring unit exceeds a predetermined threshold value. As described above, since the external terminal function is changed irregularly by executing the external terminal switching process based on the measurement result of the external environmental factor, it is more difficult for a third party to specify the function of the external terminal. Can be realized.

  A data processing system according to a fifteenth aspect of the present invention is the data processing system according to any one of the first to fourteenth aspects, in particular, the host device and / or the memory device are connected to the host-side external terminal. A detection unit configured to detect whether or not an external device is connected to the memory-side external terminal, wherein the detection unit is configured so that the host-side switching control unit and the memory-side switching control unit In the case of detecting the terminal device, the terminal switching process is set to be executed more frequently than in the case where the detection unit does not detect the external device.

  According to the data processing system of the fifteenth aspect, the host-side switching control unit and the memory-side switching control unit detect that an external device is connected between the host-side external terminal and the memory-side external terminal. Is detected, the terminal switching process is executed more frequently than when the detection unit has not detected an external device. In this way, when it is detected that an external device such as a probe is connected, it is more difficult to specify the function of the external terminal by a third party by setting the execution frequency of the terminal switching process high. It becomes possible to do.

  A data processing system according to a sixteenth aspect of the present invention is the data processing system according to any one of the first to fifteenth aspects, particularly wherein the host side switching control unit and the memory side switching control unit are the power supply terminals. The first execution condition for executing the switching process for the ground terminal and the second execution condition for the host side switching control unit and the memory side switching control unit to execute the switching process for the data terminal are different from each other. It is characterized by this.

  According to the data processing system of the sixteenth aspect, the first execution condition for executing the switching process for the power supply terminal and the ground terminal is different from the second execution condition for executing the switching process for the data terminal. Thus, the switching process of the power supply terminal and the ground terminal and the switching process of the data terminal are executed at different timings. As a result, it is possible to make it more difficult for a third party to specify the function of the external terminal.

  A data processing system according to a seventeenth aspect of the present invention is the data processing system according to any one of the first to sixteenth aspects, and in particular, a plurality of terminal switching patterns are set in the host device and the memory device. The data storage unit further stores table data, and the host-side switching control unit and the memory-side switching control unit execute a terminal switching process based on the table data.

  According to the data processing system of the seventeenth aspect, the host device and the data storage unit of the memory device store table data in which a plurality of terminal switching patterns are set, and the host side switching control unit and the memory side switching The control unit executes a terminal switching process based on the table data. Thus, by preparing in advance the table data in which a plurality of terminal switching patterns are set and storing them in the data storage unit, the connection relationship between the external terminals and the internal terminals is actively switched based on the table data. It becomes possible. Moreover, since a random terminal switching pattern can be set in the table data, it is possible to improve the randomness of terminal switching.

  The data processing system according to an eighteenth aspect of the present invention is the data processing system according to any one of the first to sixteenth aspects, in particular, wherein the host side switching control unit and the memory side switching control unit are common. The same terminal switching pattern is created by an algorithm, and terminal switching processing is executed based on the terminal switching pattern.

  According to the data processing system of the eighteenth aspect, the host side switching control unit and the memory side switching control unit respectively create the same terminal switching pattern by a common algorithm, and switch terminals based on the terminal switching pattern. Execute the process. In this way, the host-side switching control unit and the memory-side switching control unit create the same terminal switching pattern, thereby actively switching the connection relationship between the external terminal and the internal terminal based on the terminal switching pattern. Is possible. Further, since table data in which a plurality of terminal switching patterns are set is not required, a data storage unit for storing the table data can be omitted. Furthermore, it is possible to improve the randomness of terminal switching by creating a random terminal switching pattern by a random number generation algorithm. Further, since the host side switching control unit and the memory side switching control unit respectively create the terminal switching pattern, it is not necessary to transmit / receive the terminal switching pattern between the host device and the memory device. For this reason, it is possible to prevent external leakage of the terminal switching pattern.

  A data processing system according to a nineteenth aspect of the present invention is the data processing system according to any one of the first to sixteenth aspects, in particular, the host side switching control unit creates a terminal switching pattern, and the terminal Terminal switching processing is executed based on the switching pattern, and the memory side switching control unit acquires the terminal switching pattern from the host side switching control unit, and executes terminal switching processing based on the terminal switching pattern. It is characterized by this.

  According to the data processing system of the nineteenth aspect, the host side switching control unit executes terminal switching processing based on the terminal switching pattern created by itself, and the memory side switching control unit is obtained from the host side switching control unit. Terminal switching processing is executed based on the terminal switching pattern. As described above, the host-side switching control unit creates the terminal switching pattern to actively switch the connection relationship between the external terminal and the internal terminal based on the terminal switching pattern in both the host device and the memory device. Is possible. Further, since table data in which a plurality of terminal switching patterns are set is not required, a data storage unit for storing the table data can be omitted. Furthermore, the randomness of terminal switching can be improved by the host side switching control unit creating a random terminal switching pattern by a random number generation algorithm. Moreover, the host-side switching control unit can arbitrarily change the algorithm for creating the terminal switching pattern.

  The data processing system according to a twentieth aspect of the present invention is particularly the data processing system according to any one of the first to sixteenth aspects, wherein the memory side switching control unit creates a terminal switching pattern, and the terminal Terminal switching processing is executed based on the switching pattern, and the host side switching control unit acquires the terminal switching pattern from the memory side switching control unit, and executes terminal switching processing based on the terminal switching pattern. It is characterized by this.

  According to the data processing system of the twentieth aspect, the memory side switching control unit executes the terminal switching process based on the terminal switching pattern created by itself, and the host side switching control unit acquires from the memory side switching control unit. Terminal switching processing is executed based on the terminal switching pattern. As described above, the memory-side switching control unit creates the terminal switching pattern to actively switch the connection relationship between the external terminal and the internal terminal based on the terminal switching pattern in both the memory device and the host device. Is possible. Further, since table data in which a plurality of terminal switching patterns are set is not required, a data storage unit for storing the table data can be omitted. Furthermore, it is possible for the memory side switching control unit to create a random terminal switching pattern by a random number generation algorithm, thereby improving the terminal switching randomness. In addition, the memory-side switching control unit can arbitrarily change the algorithm for creating the terminal switching pattern.

  A data processing system according to a twenty-first aspect of the present invention, in the data processing system according to any one of the first to sixteenth aspects, further comprises a pattern creation device for creating a terminal switching pattern, wherein the host side switching The control unit and the memory-side switching control unit acquire the terminal switching pattern from the pattern creation device, and execute a terminal switching process based on the terminal switching pattern.

  According to the data processing system of the twenty-first aspect, the pattern creating device creates a terminal switching pattern, and the host side switching control unit and the memory side switching control unit are connected to the terminal based on the terminal switching pattern acquired from the pattern creating device. The switching process is executed. As described above, the pattern creation device creates the terminal switching pattern, so that the connection relationship between the external terminal and the internal terminal can be actively switched based on the terminal switching pattern in both the host device and the memory device. It becomes. Further, since table data in which a plurality of terminal switching patterns are set is not required, a data storage unit for storing the table data can be omitted. Furthermore, since the pattern creation device creates a random terminal switching pattern using a random number generation algorithm, it is possible to improve the randomness of terminal switching. Moreover, the pattern creating apparatus can arbitrarily change the algorithm for creating the terminal switching pattern.

  According to the present invention, it becomes possible to make the function specification of each external terminal more complicated by making it difficult to specify the data terminal position by a third party.

It is a figure which shows the structure of the data processor which concerns on embodiment of this invention. It is a figure which shows a part of structure of a terminal switching part. It is a figure which shows a part of structure of a terminal switching part. It is a figure which shows table data. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows an example of a terminal switching pattern. It is a timing chart which shows instantaneous interruption countermeasure processing. It is a figure which shows the structure of the data processing system which concerns on a 1st modification. It is a figure which shows the structure of the data processing system which concerns on a 2nd modification. It is a figure which shows the structure of the data processing system which concerns on a 3rd modification. It is a figure which shows the structure of the data processing system which concerns on a 4th modification. It is a figure which shows the structure of the data processing system which concerns on a 4th modification. It is a timing chart which shows a terminal switching process. It is a figure which shows the structure of the data processing system which concerns on a 5th modification. It is a timing chart which shows instantaneous interruption countermeasure processing. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows the structure of the data processor which concerns on a 7th modification. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows an example of a terminal switching pattern. It is a figure which shows the method of expressing the logic state of two signals with one external terminal. It is a figure which shows an example of a terminal switching pattern.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a diagram showing a configuration of a data processing system 1 according to an embodiment of the present invention. As shown in FIG. 1, the data processing system 1 includes a host device 2 and a memory device 3 that is detachably connected to the host device 2 externally.

  The host device 2 includes a data processing unit 11 such as a CPU, a terminal switching unit 12, a switching control unit 13, a data storage unit 14, and a plurality of external terminals B (in this example, 10 external terminals B0 to B9). And is configured. The data processing unit 11 has a plurality of internal terminals A (in this example, 10 internal terminals A0 to A9). In this example, the internal terminal A0 is a power supply terminal, the internal terminal A9 is a ground terminal, and the internal terminals A1 to A8 are data terminals (input terminal, output terminal, or input / output terminal). In the following description, the internal terminal A0 is also referred to as “power supply terminal”, the internal terminal A9 is also referred to as “ground terminal”, and the internal terminals A1 to A8 are also referred to as “data terminals”. It should be noted that the data processing unit 11 and the terminal switching unit 12 are preferably integrated into a single chip so that transmission / reception data between the data processing unit 11 and the terminal switching unit 12 is not analyzed by a third party. .

  The memory device 3 includes a terminal switching unit 21, a memory unit 22 having a memory controller and a memory array, a switching control unit 23, a data storage unit 24, and a plurality of external terminals C (in this example, 10 external terminals C0). To C9). The memory unit 22 has a plurality of internal terminals D (in this example, 10 internal terminals D0 to D9). In this example, the internal terminal D0 is a power supply terminal, the internal terminal D9 is a ground terminal, and the internal terminals D1 to D8 are data terminals (input terminals, output terminals, or input / output terminals). In the following description, the internal terminal D0 is also referred to as “power supply terminal”, the internal terminal D9 is also referred to as “ground terminal”, and the internal terminals D1 to D8 are also referred to as “data terminals”. It should be noted that the memory unit 22 and the terminal switching unit 21 are preferably integrated into one chip so that transmission / reception data between the memory unit 22 and the terminal switching unit 21 is not analyzed by a third party.

  FIG. 2 is a diagram illustrating a part of the configuration of the terminal switching unit 12. The terminal switching unit 12 includes switch circuits 31 and 32. The internal terminals A1 to A8 are connected to the selection terminal of the switch circuit 31. The internal terminal A0, the common terminal of the switch circuit 31, and the internal terminal A9 are connected to the selection terminal of the switch circuit 32. A common terminal of the switch circuit 32 is connected to the external terminal B0. When the switch circuits 31 and 32 perform a switching operation based on a control signal input from the switching control unit 13, any one of the internal terminals A0 to A9 is connected to the external terminal B0. Although only the configuration corresponding to the external terminal B0 is shown in FIG. 2, the configuration corresponding to the external terminals B1 to B9 is the same as that in FIG. That is, the terminal switching unit 12 arbitrarily switches the connection relationship between the internal terminals A0 to A9 and the external terminals B0 to B9 by terminal switching control by the switching control unit 13.

  FIG. 3 is a diagram illustrating a part of the configuration of the terminal switching unit 21. The terminal switching unit 21 includes switch circuits 41 and 42. The external terminal C0 is connected to the common terminal of the switch circuit 42. The selection terminal of the switch circuit 42 is connected to the internal terminal D0, the common terminal of the switch circuit 41, and the internal terminal D9. The selection terminal of the switch circuit 41 is connected to the internal terminals D1 to D8. When the switch circuits 41 and 42 perform a switching operation based on a control signal input from the switching control unit 23, the external terminal C0 is connected to any one of the internal terminals D0 to D9. 3 shows only the configuration corresponding to the external terminal C0, the configuration corresponding to the external terminals C1 to C9 is the same as that in FIG. That is, the terminal switching unit 21 arbitrarily switches the connection relationship between the internal terminals D0 to D9 and the external terminals C0 to C9 by terminal switching control by the switching control unit 23.

  FIG. 4 is a diagram showing the table data 100 stored in the data storage units 14 and 24. In the table data 100, a plurality of terminal switching patterns P (in this example, 256 terminal switching patterns P0 to P255) for defining the connection relationship between the internal terminals A and D and the external terminals B and C are set. Yes. By designating the index value, the corresponding terminal switching pattern can be arbitrarily selected.

  Referring to FIG. 1, the same table data 100 may be stored in advance in data storage units 14 and 24, or table data 100 may be stored in advance in only one of data storage units 14 and 24. . When the table data 100 is stored only in the data storage unit 14 in advance, the memory device 3 acquires the table data 100 from the host device 2 via the external terminals B and C when the data processing system 1 is activated, The table data 100 is stored in the data storage unit 24. When the table data 100 is stored only in the data storage unit 24 in advance, the host device 2 acquires the table data 100 from the memory device 3 via the external terminals B and C when the data processing system 1 is activated, The table data 100 is stored in the data storage unit 14. In addition, when transmitting / receiving the table data 100, it is desirable to encrypt the table data 100. Instead of executing transmission / reception of the table data 100 when the system is activated, the host device 2 may execute transmission / reception of the table data 100 by issuing a dedicated command. Also, a dedicated external terminal for transmitting / receiving the table data 100 may be provided separately from the external terminals B and C. Further, a partial area of the memory array in the memory unit 22 may be used as the data storage unit 24.

  FIG. 5 is a diagram illustrating an example of a terminal switching pattern set when the data processing system 1 is activated. When the system is started, the switching control units 13 and 23 set a predetermined fixed terminal switching pattern in the terminal switching units 12 and 21. In the example shown in FIG. 5, external terminals B0 and C0 are connected to internal terminals A0 and D0 which are power supply terminals, external terminals B9 and C9 are connected to internal terminals A9 and D9 which are ground terminals, and external terminals B1 to B8 and C1 are connected. C8 is connected to internal terminals A1 to A8 and D1 to D8, which are data terminals, respectively.

  FIG. 6 is a diagram illustrating an example of a terminal switching pattern that is set immediately after the start-up process of the data processing system 1 is completed. When the system activation process is completed, the switching control units 13 and 23 refer to the table data 100 to set the first terminal switching pattern P0 indicated by the index value “0” in the terminal switching units 12 and 21. In the example shown in FIG. 6, the external terminals B4 and C4 are connected to the internal terminals A0 and D0 which are power supply terminals, the external terminals B1 and C1 are connected to the internal terminals A9 and D9 which are ground terminals, and the external terminals B0, B2, B3. B5, B6, B7, B8, B9, C0, C2, C3, C5, C6, C7, C8, C9 are internal terminals A8, A5, A2, A7, A3, A4, A1, A6, D8, which are data terminals. Connected to D5, D2, D7, D3, D4, D1, and D6, respectively.

  FIG. 7 is a diagram illustrating an example of a terminal switching pattern set by executing a terminal switching process from the state illustrated in FIG. When a predetermined time (which is shorter than the time required for data analysis by a third party) elapses after the terminal switching process to the previous terminal switching pattern P0 is completed, the switching control unit 13 , 23 sets the terminal switching pattern P1 indicated by the next index value “1” in the terminal switching units 12, 21 by referring to the table data 100. In the example shown in FIG. 7, external terminals B8 and C8 are connected to internal terminals A0 and D0 which are power supply terminals, external terminals B5 and C5 are connected to internal terminals A9 and D9 which are ground terminals, and external terminals B0, B1, B2, and so on. B3, B4, B6, B7, B9, C0, C1, C2, C3, C4, C6, C7, C9 are internal terminals A3, A4, A7, A8, A2, A1, A6, A5, D3, which are data terminals. Connected to D4, D7, D8, D2, D1, D6, and D5, respectively.

  Thereafter, similarly, the switching control units 13 and 23 change the terminal switching pattern indicated by the next index value every time a predetermined time elapses after the terminal switching processing to the previous terminal switching pattern is completed. , 21. Further, after the last terminal switching pattern P255, the first terminal switching pattern P0 is set.

  Note that it is not always necessary to start from the first terminal switching pattern P0 immediately after the completion of the system activation process. The data processing unit 11 issues a dedicated command immediately after the completion of the system activation process, and the index value in the dedicated command. By designating, the start position of the terminal switching pattern in the table data 100 may be designated to the switching control units 13 and 23. In this case, the data processing unit 11 designates a different index value for each system activation process by using an arbitrary random number generation algorithm or by using an arbitrary variation factor such as the start time of the system activation process. It is desirable.

  In the example shown in FIGS. 6 and 7, the power supply terminal is switched from the external terminals B4 and C4 to the external terminals B8 and C8 by the terminal switching process, and the ground terminal is switched from the external terminals B1 and C1 to the external terminals B5 and C5. ing. Since the memory device 3 is supplied with the driving power from the host device 2, if the switching between the power supply terminal and the ground terminal is not performed reliably, the driving power supply to the memory device 3 is momentarily cut off, and the data It causes malfunction of the memory device 3 such as disappearance. Hereinafter, a measure against instantaneous interruption when switching between the power supply terminal and the ground terminal will be described.

  FIG. 8 is a timing chart showing instantaneous interruption countermeasure processing when switching between the power supply terminal and the ground terminal. FIG. 8 shows an example in which the power supply terminal is switched from the external terminals B4 and C4 to the external terminals B8 and C8, and the ground terminal is switched from the external terminals B1 and C1 to the external terminals B5 and C5.

  First, at time T1, the switching control units 13 and 23 stop data communication between the host device 2 and the memory device 3. At time T1, the switching control units 13 and 23 connect the power supply terminals before switching (connection relationship between the external terminals B4 and C4 and the internal terminals A0 and D0) and the connection relationship between the ground terminals before switching (external terminal). B1 and C1 and the internal terminals A9 and D9) are maintained in the state of maintaining the connection relationship of the power supply terminals after switching (connection relationship between the external terminals B8 and C8 and the internal terminals A0 and D0) and the ground after the switching. The terminal connection relationship (connection relationship between the external terminals B5 and C5 and the internal terminals A9 and D9) is established.

  Next, at time T2 when a predetermined time has elapsed from time T1, the switching control units 13 and 23 connect the power supply terminals before switching (connection relationship between the external terminals B4 and C4 and the internal terminals A0 and D0) and switching. The connection relationship of the previous ground terminal (connection relationship between the external terminals B1 and C1 and the internal terminals A9 and D9) is released. Thereafter, the switching control units 13 and 23 establish a new connection relationship after switching with respect to the data terminals, and resume data communication between the host device 2 and the memory device 3 using the new connection relationship.

  In addition, you may employ | adopt the following methods simpler than the countermeasure against a momentary interruption shown in FIG. That is, the data communication between the two devices is interrupted and the memory device 3 is normally terminated, and the power supply from the host device 2 to the memory device 3 is temporarily stopped. 12 terminal switching processes are executed. Then, after the terminal switching process of the terminal switching unit 12 is completed, the power supply from the host device 2 to the memory device 3 is resumed, and the switching control unit 23 executes the terminal switching process of the terminal switching unit 21. After the terminal switching process of the terminal switching unit 21 is completed, the data communication between both devices is resumed.

  As described above, according to the data processing system 1 according to the present embodiment, the terminal switching unit 12 includes the external terminal B and the internal terminal A of the data processing unit 11 (power supply terminal A0, ground terminal A9, and data terminals A1 to A8). The terminal switching unit 21 switches the connection relationship between the external terminal C and the internal terminal D (the power supply terminal D0, the ground terminal D9, and the data terminals D1 to D8) of the memory unit 22. That is, not only the data terminals A1 to A8 and D1 to D8 but also the power supply terminals A0 and D0 and the ground terminals A9 and D9 are switched in the connection relationship between the external terminals B and C and the internal terminals A and D. Therefore, it is difficult for a third party who attempts illegal copying to specify the external terminals B and C functioning as the reference power supply terminal and the ground terminal, and therefore the external terminals B and C functioning as the data terminals are specified. It becomes difficult. That is, it is possible to make it difficult to specify the functions of the external terminals B and C by a third party. As a result, it becomes difficult to analyze the data transmitted and received between the data terminals, so that illegal copying of content data stored in the memory device 3 can be effectively prevented.

  As shown in FIG. 8, according to the data processing system 1 according to the present embodiment, when switching the external terminals B and C functioning as power supply terminals, the switching control units 13 and 23 Before the connection between the external terminals B4 and C4 and the power supply terminals A0 and D0 is released, the switched external terminals B8 and C8 and the power supply terminals A0 and D0 are connected. Accordingly, since the power supply from the host device 2 to the memory device 3 can be reliably prevented from being momentarily interrupted when the power supply terminal is switched, the malfunction of the memory device 3 due to the instantaneous power supply interruption is prevented. It becomes possible. Further, compared with the case where driving power is supplied from the power supply unit 54 such as a battery to the memory device 3 before and after the switching timing of the power supply terminal (FIG. 15), the mounting of the power supply unit 54 to the memory device 3 becomes unnecessary. Cost and circuit scale can be reduced.

  Further, as shown in FIG. 5, according to the data processing system 1 according to the present embodiment, the switching control unit 13 determines the power supply terminal A0 and the ground terminal A9 of the data processing unit 11 in advance when the system is started. The switching control unit 23 connects the power terminal D0 and the ground terminal D9 of the memory unit 22 to predetermined specific external terminals C0 and C9, respectively. As described above, since the power supply terminal and the ground terminal are fixed to a specific external terminal when the system is started, the power supply terminal and the ground terminal need not be searched for by the memory device 3. Processing can be executed promptly.

  Further, according to the data processing system 1 according to the present embodiment, the terminal switching process of the external terminals B and C is executed when a predetermined time has elapsed since the completion of the previous terminal switching process. The As described above, since the function of the external terminals B and C is periodically changed by executing the terminal switching process of the external terminals B and C based on the passage of time, the external terminals B and C by a third party are changed. It becomes possible to further make it difficult to specify the function.

  Further, according to the data processing system 1 according to the present embodiment, the table data 100 in which a plurality of terminal switching patterns P are set is stored in the data storage units 14 and 24 of the host device 2 and the memory device 3. The switching control units 13 and 23 execute terminal switching processing based on the table data 100. Thus, by preparing the table data 100 in which a plurality of terminal switching patterns P are set in advance and storing them in the data storage units 14 and 24, the external terminals B and C and the internal terminals are based on the table data 100. The connection relationship with A and D can be actively switched. Further, since the random terminal switching pattern P can be set in the table data 100, the randomness of terminal switching can be improved.

<First Modification>
In the above embodiment, the switching control units 13 and 23 execute the terminal switching process based on the table data 100 stored in the data storage units 14 and 24. However, instead of referring to the table data 100, the switching control is performed. Both units 13 and 23 may create their own terminal switching patterns.

  FIG. 9 is a diagram illustrating a configuration of the data processing system 1 according to the first modification. The data storage units 14 and 24 are omitted from the configuration shown in FIG.

  The switching control units 13 and 23 respectively create the same terminal switching pattern by a common algorithm, and execute the terminal switching process of the terminal switching units 12 and 21 based on the terminal switching pattern. As an algorithm for creating the terminal switching pattern, for example, an arbitrary random number generation algorithm can be used.

  According to the data processing system 1 according to the first modification, the switching control units 13 and 23 respectively create the same terminal switching pattern by a common algorithm, and execute the terminal switching process based on the terminal switching pattern. . In this way, the switching control units 13 and 23 each create the same terminal switching pattern, so that the connection relationship between the external terminals B and C and the internal terminals A and D is actively switched based on the terminal switching pattern. It becomes possible. Further, since the table data 100 is unnecessary, the data storage units 14 and 24 for storing the table data 100 can be omitted. Furthermore, it is possible to improve the randomness of terminal switching by creating a random terminal switching pattern by a random number generation algorithm. In addition, since the switching control units 13 and 23 create terminal switching patterns, it is not necessary to transmit and receive terminal switching patterns between the host device 2 and the memory device 3. For this reason, it is possible to prevent external leakage of the terminal switching pattern.

<Second Modification>
In the above embodiment, the switching control units 13 and 23 execute the terminal switching process based on the table data 100 stored in the data storage units 14 and 24. However, instead of referring to the table data 100, the switching control is performed. One of the units 13 and 23 may create a terminal switching pattern.

  The configuration of the data processing system 1 according to the second modification is the same as that shown in FIG.

  As a first example in which the switching control unit 13 creates a terminal switching pattern, the switching control unit 13 generates a random number using an arbitrary random number generation algorithm, and creates a random terminal switching pattern using the random number.

  As a second example in which the switching control unit 13 creates a terminal switching pattern, the switching control unit 13 extracts and extracts a value of a specific area in a command transmitted to the memory device 3 or in data received from the memory device 3. A terminal switching pattern is created by using the value as it is or by performing a predetermined calculation on the extracted value.

  As a third example in which the switching control unit 13 creates a terminal switching pattern, the switching control unit 13 keeps the same table data 100 as in the above embodiment and uses the extracted value as an index value. The terminal switching pattern is created by reading the terminal switching pattern corresponding to the index value from the table data 100.

  As a fourth example in which the switching control unit 13 creates a terminal switching pattern, as shown in FIG. 10, a measurement unit 51 that measures any external environmental factor such as temperature, humidity, illuminance, or sound pressure is provided in the host device 2. The switching control unit 13 uses the digital voltage value obtained by A / D conversion of the analog measurement value output from the measurement unit 51 as it is, or with respect to the voltage value. A terminal switching pattern is created by performing a predetermined calculation.

  As a fifth example in which the switching control unit 13 creates a terminal switching pattern, the switching control unit 13 shifts the terminal arrangement by a predetermined number in a predetermined direction with respect to the currently set terminal switching pattern or fixes it. Alternatively, a new terminal switching pattern is easily created by inverting the terminal arrangement with the variable specific external terminal as a reference.

  As a sixth example in which the switching control unit 13 creates a terminal switching pattern, the switching control unit 13 targets a plurality of external terminals B functioning as data terminals, and the data on the data terminal after the terminal switching pattern is switched last time. The order of the terminals in which the signal value of the signal transitions from Low to High early (or the reverse order) is recorded, and the next terminal switching pattern is created in accordance with the order.

  The first to sixth examples can be applied in any combination, and other arbitrary examples can be combined.

  The switching control unit 13 executes the terminal switching process of the terminal switching unit 12 based on the terminal switching pattern created by itself in the above example. In addition, the switching control unit 23 acquires the terminal switching pattern from the switching control unit 13 through the external terminals B and C or through a dedicated external terminal for transmitting and receiving the terminal switching pattern. And based on the terminal switching pattern acquired from the switching control part 13, the terminal switching process of the terminal switching part 21 is performed. In addition, when transmitting / receiving a terminal switching pattern, it is desirable to encrypt the terminal switching pattern. The terminal switching pattern may be transmitted / received by being embedded in a normal command such as a read command or a write command, or may be transmitted / received by a dedicated command for transmitting / receiving the terminal switching pattern. In the third example, only the index value is transmitted from the switching control unit 13 to the switching control unit 23 by holding the same table data 100 as the switching control unit 13 in the switching control unit 23. do it.

  According to the data processing system 1 according to the second modification, the switching control unit 13 executes the terminal switching process of the terminal switching unit 12 based on the terminal switching pattern created by itself, and the switching control unit 23 is the switching control unit 13. The terminal switching process of the terminal switching unit 21 is executed based on the terminal switching pattern acquired from the above. In this way, the switching control unit 13 creates the terminal switching pattern, so that both the host device 2 and the memory device 3 connect the external terminals B and C and the internal terminals A and D based on the terminal switching pattern. The relationship can be actively switched. Further, since the table data 100 is unnecessary, the data storage units 14 and 24 for storing the table data 100 can be omitted. Furthermore, it is possible for the switching control unit 13 to improve the randomness of terminal switching by creating a random terminal switching pattern using a random number generation algorithm. Moreover, the switching control unit 13 can arbitrarily change the algorithm for creating the terminal switching pattern.

  In the above description, the switching control unit 13 creates a terminal switching pattern, and the switching control unit 23 acquires the terminal switching pattern from the switching control unit 13, but conversely, the switching control unit 23. May create a terminal switching pattern, and the switching control unit 13 may acquire the terminal switching pattern from the switching control unit 23, and the same effect as described above can be obtained.

<Third Modification>
In the above embodiment, the switching control units 13 and 23 execute the terminal switching process based on the table data 100 stored in the data storage units 14 and 24. However, instead of referring to the table data 100, the host device 2 and a terminal switching pattern may be created outside the memory device 3.

  FIG. 11 is a diagram showing a configuration of the data processing system 1 according to the third modification. The data storage units 14 and 24 are omitted from the configuration shown in FIG. 1, and the pattern creation device 4 is added outside the host device 2 and the memory device 3.

  The pattern creation device 4 generates a random number using an arbitrary random number generation algorithm, and creates a random terminal switching pattern using the random number.

  The switching control unit 13 acquires a terminal switching pattern from the pattern creation device 4. In addition, the switching control unit 23 acquires a terminal switching pattern from the pattern creation device 4 via the host device 2. Specifically, the switching control unit 23 acquires a terminal switching pattern from the switching control unit 13 via the external terminals B and C or a dedicated external terminal for transmitting and receiving the terminal switching pattern. Contrary to the above example, the switching control unit 23 acquires the terminal switching pattern from the pattern creation device 4, and the switching control unit 13 acquires the terminal switching pattern from the pattern creation device 4 via the memory device 3. You may get it.

  According to the data processing system 1 according to the third modification, the pattern creation device 4 creates a terminal switching pattern, and the switching control units 13 and 23 perform terminal switching processing based on the terminal switching pattern acquired from the pattern creation device 4. Execute. As described above, when the pattern creating device 4 creates the terminal switching pattern, the connection between the external terminals B and C and the internal terminals A and D based on the terminal switching pattern in both the host device 2 and the memory device 3. The relationship can be actively switched. Further, since the table data 100 is unnecessary, the data storage units 14 and 24 for storing the table data 100 can be omitted. Furthermore, the pattern creation device 4 creates a random terminal switching pattern by a random number generation algorithm, so that the randomness of terminal switching can be improved. Moreover, the pattern creating device 4 can arbitrarily change the algorithm for creating the terminal switching pattern.

<Fourth Modification>
In the above embodiment, the switching control units 13 and 23 execute the next terminal switching process when a predetermined time has elapsed since the terminal switching process to the previous terminal switching pattern was completed. The next terminal switching process may be executed based on the factor.

  The configuration of the data processing system 1 according to the fourth modification is the same as that shown in FIG.

  As a first example, the switching control units 13 and 23 execute the terminal switching process on condition that a dedicated command instructing execution of the terminal switching process is transmitted from the host device 2 to the memory device 3. The dedicated command is transmitted from the host device 2 to the memory device 3 via the external terminals B and C or via a dedicated external terminal for transmitting and receiving the dedicated command.

  As a second example, the switching control units 13 and 23 execute terminal switching processing on condition that data of a predetermined value set in advance is transmitted and received between the host device 2 and the memory device 3. For example, when 8-bit “5E” (h) is set as the predetermined value data, switching is performed when the data transmitted from the memory device 3 to the host device 2 is “5E” (h). The control units 13 and 23 execute terminal switching processing.

  As a third example, as shown in FIG. 12, a measurement unit 52 that measures any external environmental factor such as temperature, humidity, illuminance, or sound pressure is mounted on the host device 2 (or memory device 3). When the measured value output from the measuring unit 52 exceeds a predetermined threshold value, the switching control units 13 and 23 execute a terminal switching process. Alternatively, the measurement unit 52 may be mounted on both the host device 2 and the memory device 3, and the terminal switching process may be executed when the difference between the measured values exceeds a predetermined threshold value.

  As a fourth example, as shown in FIG. 13, a detection unit 53 that detects whether or not an external device such as a probe is connected between the external terminals B and C by measuring capacitance or a load, When mounted on at least one of the device 2 and the memory device 3 and the detection unit 53 detects the connection of an external device, the switching control units 13 and 23 set the execution frequency of the terminal switching process at a normal time ( Set higher than (when not detected). For example, when the terminal switching process is executed at intervals of 1 second at normal times, when the detection unit 53 detects the connection of an external device, the execution interval of the terminal switching process is set to 0.5 seconds. Alternatively, the terminal switching process may be executed at a predetermined time interval when the detection unit 53 detects the connection of an external device without executing the terminal switching process in a normal state.

  The first to fourth examples can be applied in any combination, and other arbitrary examples can be combined.

  Further, in the above embodiment, the terminal switching process is executed collectively for all the external terminals B and C. However, even if the execution conditions of the terminal switching process are different between the power supply terminal, the ground terminal, and the data terminal. good.

  FIG. 14 is a timing chart showing five terminal switching processes that are periodically executed. At time T1, since the execution condition related to the power supply terminal and the ground terminal is satisfied and the execution condition related to the data terminal is not satisfied, the terminal switching process for only the power supply terminal and the ground terminal is executed. In this case, for example, a terminal switching process for exchanging the power supply terminal and the ground terminal is executed. At time T3, the execution condition regarding the power supply terminal and the ground terminal is not satisfied, and the execution condition regarding the data terminal is satisfied, so that the terminal switching process for only the data terminal is executed. At times T2, T4, and T5, the terminal switching process for all of the power supply terminal, the ground terminal, and the data terminal is performed because the execution condition for the power supply terminal and the ground terminal and the execution condition for the data terminal are both satisfied. Is running.

  According to the data processing system 1 according to the fourth modification, the terminal switching process is executed when a predetermined command for instructing the execution of the terminal switching process is transmitted from the host device 2 to the memory device 3. As described above, when a dedicated command instructing execution of the terminal switching process is issued from the host device 2, the functions of the external terminals B and C are irregularly changed by executing the terminal switching process. It becomes possible to make it more difficult to specify the functions of the external terminals B and C by a third party.

  Further, according to the data processing system 1 according to the fourth modification, the terminal switching process is executed when data of a predetermined value set in advance is transmitted / received between the host device 2 and the memory device 3. . As described above, since the function of the external terminals B and C is irregularly changed by executing the terminal switching process based on the contents of data transmitted and received between both devices, the external terminal B by a third party is changed. , C can be made more difficult to specify.

  Further, according to the data processing system 1 according to the fourth modification, the terminal switching process is executed when the measured value of the external environmental factor by the measuring unit 52 exceeds a predetermined threshold value. As described above, since the function of the external terminals B and C is irregularly changed by executing the terminal switching process based on the measurement result of the external environment factor, the function specification of the external terminal by a third party is further performed. It becomes possible to make it difficult.

  Moreover, according to the data processing system 1 which concerns on a 4th modification, the switching control parts 13 and 23 are the cases where the detection part 53 has detected that the external apparatus is connected between the external terminals B and C The terminal switching process is executed more frequently than when the detection unit 53 has not detected an external device. As described above, when it is detected that an external device such as a probe is connected, the function of the external terminals B and C can be further specified by a third party by setting the execution frequency of the terminal switching process high. It becomes possible to make it difficult.

  Moreover, according to the data processing system 1 which concerns on a 4th modification, the execution conditions which perform the terminal switching process regarding a power supply terminal and a ground terminal, and the execution conditions which perform the terminal switching process regarding a data terminal are mutually different. Thus, the switching process of the power supply terminal and the ground terminal and the switching process of the data terminal are executed at different timings. As a result, it is possible to make it more difficult to specify the functions of the external terminals B and C by a third party.

<Fifth Modification>
In the above-described embodiment, the instantaneous power failure countermeasure is taken by overlapping the connection relations before and after the terminal switching for a certain period with respect to the power supply terminal and the ground terminal, but the instantaneous power failure countermeasure can also be taken by other methods.

  FIG. 15 is a diagram showing the configuration of the data processing system 1 according to the fifth modification. In contrast to the configuration shown in FIG. 1, a power supply unit 54 such as a battery is added to the memory device 3.

  FIG. 16 is a timing chart showing a measure against instantaneous interruption when switching between the power supply terminal and the ground terminal. FIG. 16 shows an example in which the power supply terminal is switched from the external terminals B4 and C4 to the external terminals B8 and C8, and the ground terminal is switched from the external terminals B1 and C1 to the external terminals B5 and C5.

  The switching controllers 13 and 23 execute terminal switching processing at time T1.

  The switching control unit 23 causes the power supply unit 54 to supply driving power to the memory device 3 in a predetermined period (for example, 1 second) before and after the switching timing (time T1). Specifically, power is supplied from the power supply unit 54 to the memory device 3 in a period from time T2 before time T1 to time T3 after time T1. After time T3, power supply from the power supply unit 54 is stopped. Unlike the above embodiment, it is not necessary to interrupt data communication between the host device 2 and the memory device 3 before and after the switching timing.

  According to the data processing system 1 according to the fifth modification, the memory device 3 includes the power supply unit 54 such as a battery, and when the external terminal functioning as the power supply terminal is switched, the power supply unit before and after the switching timing. 54 supplies drive power to the memory device 3. Accordingly, since the power supply to the memory device 3 can be reliably prevented from being momentarily interrupted when switching the power supply terminal, it is possible to prevent malfunction of the memory device 3 due to the instantaneous interruption of the power supply. Become. Further, compared with a case where an overlap period for overlapping old and new power supply terminals is provided before and after the switching timing of the power supply terminals (FIG. 8), it is possible to avoid occurrence of a data communication interruption period.

<Sixth Modification>
In the above embodiment, the power supply terminals A0 and D0 are connected to the fixed external terminals B0 and C0 and the ground terminals A9 and D9 are connected to the fixed external terminals B9 and C9 when the system is started. In addition, the external terminals B and C connected to the power supply terminals A0 and D0 and the ground terminals A9 and D9 can be arbitrarily set.

  17 and 18 are diagrams illustrating an example of a terminal switching pattern set when the data processing system 1 is activated. Referring to FIG. 17, first, switching control unit 13 arbitrarily sets external terminal B connected to ground terminal A9. In this example, the external terminal B6 is set as an external terminal connected to the ground terminal A9, and the external terminal B6 and the ground terminal A9 are connected. As a result, the ground potential is supplied from the ground terminal A9 to the external terminals B6 and C6.

  Next, the switching control unit 23 determines the external terminal C6 to which the ground potential is supplied by measuring the potential of each of the external terminals C0 to C9, and connects the external terminal C6 to the ground terminal D9.

  Next, the switching control unit 13 arbitrarily sets the external terminal B connected to the power supply terminal A0. In this example, the external terminal B7 is set as an external terminal connected to the power supply terminal A0, and the external terminal B7 and the power supply terminal A0 are connected. As a result, the power supply potential is supplied from the power supply terminal A0 to the external terminals B7 and C7.

  Next, the switching control unit 23 measures the potential difference between the external terminal C6 specified as the ground terminal and each of the other external terminals C0 to C5 and C7 to C9, thereby corresponding to the potential difference between the power supply potential and the ground potential. The external terminal C7 in which the potential difference is generated is specified. Then, the specified external terminal C7 is connected to the power supply terminal D0.

  Referring to FIG. 18, next, the switching control unit 13 sets external terminals B0 to B5, B8, and B9 other than the external terminals B6 and B7 set as the ground terminal and the power supply terminal as data terminals, and in a predetermined order. Connect to data terminals A1-A8. Similarly, the switching control unit 23 sets external terminals C0 to C5, C8, and C9 other than the external terminals C6 and C7 set as the ground terminal and the power supply terminal as data terminals, and performs data in the same order as the predetermined order. Connect to terminals D1-D8.

  According to the data processing system 1 according to the sixth modification, at the time of system startup, the switching control unit 13 connects the power supply terminal A0 and the ground terminal A9 of the data processing unit 11 to arbitrary external terminals B7 and B6, respectively. The switching control unit 23 connects the two external terminals C7 and C6 in which a potential difference corresponding to the difference between the power supply potential and the ground potential is generated to the power supply terminal D0 and the ground terminal D9 of the memory unit 22, respectively. Therefore, since the power supply terminal and the ground terminal can be arbitrarily set even when the system is activated, it is possible to further make it difficult to specify the functions of the external terminals B and C by a third party.

<Seventh Modification>
FIG. 19 is a diagram showing a configuration of the data processing apparatus 1 according to the seventh modification. The host device 2 is provided with more external terminals B than the total number of internal terminals A, and the memory device 3 is provided with more external terminals C than the total number of internal terminals D. In this example, 14 external terminals B0 to B13 and C0 to C13 are provided.

  FIG. 20 is a diagram illustrating an example of a terminal switching pattern set in the terminal switching units 12 and 21. In the example shown in FIG. 20, the external terminals B11 and C11 are set as power supply terminals, the external terminals B2 and C2 are set as ground terminals, and the external terminals B1, B3, B5-B9, B13, C1, C3, C5- C9 and C13 are set as data terminals.

  The remaining external terminals B0, B4, B10, and B12 that are not connected to any of the internal terminals A0 to A9 among the external terminals B0 to B13 are set as dummy terminals. Similarly, the remaining external terminals C0, C4, C10, and C12 that are not connected to any of the internal terminals D0 to D9 among the external terminals C0 to C13 are set as dummy terminals.

  The switching control units 13 and 23 are connected between the external terminals B0, B4, B10, and B12 that are dummy terminals on the host device 2 side and the external terminals C0, C4, C10, and C12 that are dummy terminals on the memory device 3 side. The random data that is meaningless as dummy data is transmitted and received.

  FIG. 21 is a diagram illustrating an example of a terminal switching pattern set by executing a terminal switching process from the state illustrated in FIG. The switching control units 13 and 23 switch the power supply terminal, the ground terminal, and the data terminal by the terminal switching process, and also switch the dummy terminal. In the example shown in FIG. 21, the external terminals B1, B5, B8, B13, C1, C5, C8, and C13 are set as dummy terminals.

  According to the data processing system 1 according to the seventh modification, the total number of external terminals B is larger than the total number of internal terminals A of the data processing unit 11, and the total number of external terminals C is the total number of internal terminals D of the memory unit 22. More than. That is, among all the external terminals B0 to B13, there are dummy terminals that are not connected to the internal terminals A0 to A9 of the data processing unit 11, and among all the external terminals C0 to C13, there are internal terminals D0 of the memory unit 22. There is a dummy terminal not connected to D9. Therefore, it becomes possible to further make it difficult to specify the functions of the external terminals B and C by a third party.

  Moreover, according to the data processing system 1 which concerns on a 7th modification, the switching control parts 13 and 23 switch a dummy terminal by a terminal switching process. In this way, it is possible to make it more difficult for a third party to specify the functions of the external terminals B and C by actively switching the dummy terminals instead of fixing them.

  Further, according to the data processing system 1 according to the seventh modification, the switching control units 13 and 23 transmit and receive dummy data between the dummy terminal on the host device 2 side and the dummy terminal on the memory device 3 side. Accordingly, it becomes difficult to distinguish between the dummy terminal and the data terminal, so that it is possible to make it more difficult to specify the functions of the external terminals B and C by a third party.

<Eighth Modification>
The configuration of the data processing system 1 according to the eighth modification is the same as that shown in FIG.

  FIG. 22 is a diagram illustrating an example of a terminal switching pattern set in the terminal switching units 12 and 21. In the example shown in FIG. 22, the external terminals B4 and C4 are set as power supply terminals, and the external terminals B1 and C1 are set as ground terminals. The external terminals B0, B2, B6, B8, C0, C2, C6, and C8 are set as data terminals. The remaining external terminals B3, B5, B7, B9, C3, C5, C7, and C9 that are not connected to any of the internal terminals A0 to A9 and D0 to D9 among the external terminals B0 to B9 and C0 to C9 are dummy terminals. Is set. The switching control units 13 and 23 are connected between the external terminals B3, B5, B7, and B9 that are dummy terminals on the host device 2 side and the external terminals C3, C4, C7, and C9 that are dummy terminals on the memory device 3 side. The random data that is meaningless as dummy data is transmitted and received.

  Two data terminals among the data terminals A1 to A8 of the data processing unit 11 are connected to each of the external terminals B0, B2, B6, and B8 set as data terminals. For example, data terminals A6 and A7 are connected to the external terminal B0, and data terminals A1 and A4 are connected to the external terminal B2. Similarly, two of the data terminals D1 to D8 of the memory unit 22 are connected to each of the external terminals C0, C2, C6, and C8 set as data terminals. For example, data terminals D2 and D8 are connected to the external terminal C6, and data terminals D3 and D5 are connected to the external terminal C8.

  FIG. 23 is a diagram illustrating a technique for expressing the logical states of two signals by one external terminal. As shown in FIG. 23, the logic state of two 1-bit signals is expressed by setting the voltage value of the pulse output from the external terminal to 4 (in this example, 0V, 2V, 3V, and 5V). can do.

  It is also possible to connect three or more internal terminals A and D to one external terminal B and C. For example, the logic state of three 1-bit signals can be set by setting the voltage value of a pulse to eight ways. Can be expressed.

  24 is a diagram illustrating an example of a terminal switching pattern set by executing a terminal switching process from the state illustrated in FIG. The switching control units 13 and 23 switch the power supply terminal, the ground terminal, and the data terminal by the terminal switching process, and also switch the dummy terminal. In the example shown in FIG. 24, the external terminals B0, B2, B6, B8, C0, C2, C6, and C8 are set as dummy terminals.

  The switching control unit 13 switches the combination of the data terminals A1 to A8 connected to one external terminal B by terminal switching processing. For example, in FIG. 22, the combinations of (A6, A7), (A1, A4), (A2, A8), (A3, A5) are set for the data terminals, but in FIG. 24, (A1, A7), ( A combination of (A2, A4), (A3, A6), (A5, A8) is set. Similarly, the switching control unit 23 switches the combination of data terminals D1 to D8 connected to one external terminal C by terminal switching processing.

  According to the data processing system 1 according to the eighth modification, the switching control unit 13 connects two or more data terminals A1 to A8 of the data processing unit 11 to one external terminal B, and the switching control unit 13 23 connects two or more data terminals D1 to D8 of the memory unit 22 to one external terminal C. In this way, the external terminals B and C and the internal terminals A and D are not connected one-on-one, but by connecting two or more internal terminals A and D to one external terminal B and C, It becomes possible to make it more difficult to specify the functions of the external terminals B and C by the three parties.

  Moreover, according to the data processing system 1 which concerns on an 8th modification, the switching control part 13 switches the combination of the data terminals A1-A8 connected to one external terminal B by a terminal switching process, and a switching control part 23 switches the combination of the data terminals D1-D8 connected to one external terminal C by a terminal switching process. In this way, the function of the external terminals B and C by a third party can be achieved by actively switching the data terminals A1 to A8 and D1 to D8 connected to one external terminal B and C instead of fixing them. Identification can be made more difficult.

  Moreover, according to the data processing system 1 which concerns on an 8th modification, the switching control parts 13 and 23 switch a dummy terminal by a terminal switching process. In this way, it is possible to make it more difficult for a third party to specify the functions of the external terminals B and C by actively switching the dummy terminals instead of fixing them.

  According to the data processing system 1 according to the eighth modification, the switching control units 13 and 23 transmit and receive dummy data between the dummy terminal on the host device 2 side and the dummy terminal on the memory device 3 side. Accordingly, it becomes difficult to distinguish between the dummy terminal and the data terminal, so that it is possible to make it more difficult to specify the functions of the external terminals B and C by a third party.

  Note that the above-described first to eighth modifications can be applied in appropriate combination as necessary.

DESCRIPTION OF SYMBOLS 1 Data processing system 2 Host apparatus 3 Memory apparatus 4 Pattern production apparatus 11 Data processing part 12 Terminal switching part 13 Switching control part 14 Data storage part 21 Terminal switching part 22 Memory part 23 Switching control part 24 Data storage part 51,52 Measurement part 53 Detection Unit 54 Power Supply Unit

Claims (21)

A host device;
A memory device connected to the host device;
With
The host device is
A plurality of host-side external terminals connected to the memory device;
A data processing unit having a power supply terminal, a ground terminal, and a plurality of data terminals connected to the host-side external terminal;
A host-side terminal switching unit that switches a connection relationship between the plurality of host-side external terminals and the power supply terminal, the ground terminal, and the data terminal of the data processing unit;
A host side switching control unit for controlling terminal switching by the host side terminal switching unit;
Have
The memory device includes:
A plurality of memory side external terminals connected to the plurality of host side external terminals;
A memory unit having a power supply terminal, a ground terminal, and a plurality of data terminals connected to the external terminal on the memory side;
A memory-side terminal switching unit that switches a connection relationship between the plurality of memory-side external terminals and the power supply terminal, the ground terminal, and the data terminal of the memory unit;
Corresponding to the switching control by the host side switching control unit, a memory side switching control unit for controlling terminal switching by the memory side terminal switching unit;
A data processing system. The total number of the host side external terminals is larger than the total number of the power supply terminals, the ground terminals, and the data terminals of the data processing unit,
The data processing system according to claim 1, wherein a total number of the memory side external terminals is larger than a total number of the power supply terminals, the ground terminals, and the data terminals of the memory unit. The host-side switching control unit switches a host-side dummy terminal that is not connected to any of the power terminal, the ground terminal, and the data terminal of the data processing unit among the plurality of host-side external terminals,
The memory-side switching control unit switches a memory-side dummy terminal that is not connected to any of the power supply terminal, the ground terminal, and the data terminal of the memory unit among the plurality of memory-side external terminals. The data processing system described. The host side switching control unit connects two or more data terminals of the data processing unit to one host side external terminal,
The data processing system according to claim 1, wherein the memory side switching control unit connects two or more data terminals of the memory unit to one memory side external terminal. The host-side switching control unit switches a combination of two or more data terminals of the data processing unit connected to one host-side external terminal;
The data processing system according to claim 4, wherein the memory side switching control unit switches a combination of two or more data terminals of the memory unit connected to one memory side external terminal.   The host-side switching control unit and the memory-side switching control unit are a host-side dummy that is not connected to any of the power terminal, the ground terminal, and the data terminal of the data processing unit among the plurality of host-side external terminals. Sends and receives meaningless data between the terminal and the memory-side dummy terminal that is not connected to any of the power supply terminal, the ground terminal, and the data terminal of the memory unit among the plurality of memory-side external terminals. The data processing system according to any one of claims 2 to 5. When switching the host-side external terminal and the memory-side external terminal corresponding to the power supply terminals of the data processing unit and the memory unit,
The host side switching control unit, before releasing the connection between the host side external terminal before switching and the power supply terminal of the data processing unit, the host side external terminal after switching and the data processing unit of the data processing unit Connect the power terminal and
The memory-side switching control unit is configured to switch the memory-side external terminal after switching and the power-supply terminal of the memory unit before releasing the connection between the memory-side external terminal before switching and the power-supply terminal of the memory unit. The data processing system according to any one of claims 1 to 6, wherein The memory device further includes a power feeding unit that supplies driving power of the memory device,
When switching the host-side external terminal and the memory-side external terminal corresponding to the power supply terminals of the data processing unit and the memory unit, the power feeding unit supplies driving power to the memory device before and after the switching timing. The data processing system according to claim 1, wherein the data processing system is supplied. At startup of the data processing system,
The host side switching control unit connects the power supply terminal and the ground terminal of the data processing unit to a predetermined specific host side external terminal, respectively.
9. The memory-side switching control unit according to claim 1, wherein the memory-side switching control unit connects the power supply terminal and the ground terminal of the memory unit to a predetermined specific memory-side external terminal, respectively. Data processing system. At startup of the data processing system,
The host side switching control unit connects the power supply terminal and the ground terminal of the data processing unit to an arbitrary host side external terminal, respectively.
The memory side switching control unit includes two memory side external terminals having a potential difference corresponding to a difference between a power source potential and a ground potential among the plurality of memory side external terminals, the power source terminal of the memory unit and The data processing system according to claim 1, wherein the data processing system is connected to each of the ground terminals. The execution conditions under which the host-side switching control unit and the memory-side switching control unit execute terminal switching processing include:
The data processing system according to any one of claims 1 to 10, which includes that a predetermined time has elapsed since completion of the previous switching process. The execution conditions under which the host-side switching control unit and the memory-side switching control unit execute terminal switching processing include:
The data processing system according to claim 1, wherein a predetermined command instructing execution of switching processing is transmitted from the host device to the memory device. The execution conditions under which the host-side switching control unit and the memory-side switching control unit execute terminal switching processing include:
The data processing system according to any one of claims 1 to 12, wherein data of a predetermined value set in advance is transmitted and received between the host device and the memory device. The host device and / or the memory device further includes a measurement unit that measures a predetermined external environmental factor,
The execution conditions under which the host-side switching control unit and the memory-side switching control unit execute terminal switching processing include:
The data processing system according to claim 1, wherein the measured value by the measuring unit includes exceeding a predetermined threshold value. The host device and / or the memory device further includes a detection unit that detects whether an external device is connected between the host-side external terminal and the memory-side external terminal,
The host-side switching control unit and the memory-side switching control unit switch the terminal when the detection unit detects the external device than when the detection unit does not detect the external device. The data processing system according to claim 11, wherein the execution frequency of the processing is set high.   A first execution condition for the host side switching control unit and the memory side switching control unit to perform switching processing relating to the power supply terminal and the ground terminal, and the host side switching control unit and the memory side switching control unit include the data The data processing system according to any one of claims 11 to 15, which is different from a second execution condition for executing a switching process relating to a terminal. The host device and the memory device further include a data storage unit that stores table data in which a plurality of terminal switching patterns are set.
The data processing system according to claim 1, wherein the host side switching control unit and the memory side switching control unit execute a terminal switching process based on the table data.   The host-side switching control unit and the memory-side switching control unit respectively create the same terminal switching pattern by a common algorithm and execute terminal switching processing based on the terminal switching pattern. The data processing system according to any one of the above. The host-side switching control unit creates a terminal switching pattern, executes a terminal switching process based on the terminal switching pattern,
The said memory side switching control part acquires the said terminal switching pattern from the said host side switching control part, and performs the switching process of a terminal based on the said terminal switching pattern. Data processing system. The memory side switching control unit creates a terminal switching pattern, executes a terminal switching process based on the terminal switching pattern,
The said host side switching control part acquires the said terminal switching pattern from the said memory side switching control part, and performs the switching process of a terminal based on the said terminal switching pattern. Data processing system. It further comprises a pattern creation device for creating a terminal switching pattern,
The host-side switching control unit and the memory-side switching control unit acquire the terminal switching pattern from the pattern creation device, and execute terminal switching processing based on the terminal switching pattern. The data processing system as described in any one.

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